US Patent 9303444 Door rail system

A door rail system for mounting a pane includes a clamp housing having a tapered projection and a pair of clamps having a recess. A screw fastens the clamps together from a side of the clamp housing so that the recesses and tapered projection are configured to form a secure dovetail joint for holding a pane. The recesses (and clamps) are symmetrical and the tapered projection is at the center so that a pane can be securely held at the center without being tilted. The door rail system includes an accessory channel and first and second mounting members. The first and second mounting members are slidably attached to each other by a sliding dovetail joint so that each mounting member can slide against the other mounting member.